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Li-ion secondary battery and its making method

A secondary battery and lithium-ion technology, which is applied in the manufacture of secondary batteries, secondary battery components, and electrolyte batteries, and can solve problems such as leakage and uneven distribution of electrolyte

Active Publication Date: 2008-07-02
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is intended to overcome the deficiencies of the prior art above, to provide a cylindrical lithium ion secondary battery that can help solve the problem of uneven electrolyte distribution and leakage in the process of charging and discharging the cylindrical lithium ion secondary battery. Ion secondary battery and manufacturing method thereof

Method used

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  • Li-ion secondary battery and its making method

Examples

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Embodiment 1

[0023] Such as figure 1 and figure 2 As shown, a cylindrical lithium ion secondary battery includes a cylindrical cylinder 10 and an electrode group 20 housed in the cylinder, the electrode group is wound into a cylindrical shape and has a space defined in its center, A central pin 30 of a polyvinylidene fluoride physical gel with a microporous structure, specifically a PVDF-HFP gel, is arranged in the space defined by the center of the electrode group. When the electrolyte solution enters the gel center pin 30 with a microporous structure, a lateral force is generated due to swelling to press against the electrode assembly 20 . The center pin 30 is a solid cylinder and has an "I" shape as a whole. The outer diameter of the polyvinylidene fluoride physical gel 30 is not greater than the diameter of the cylindrical space at the center of the electrode assembly 30 . Preferably, the outer diameter of the cylinder of the polyvinylidene fluoride physical gel is 50%-99% of the d...

Embodiment 2

[0026] Such as Figure 3-Figure 4 As shown, another cylindrical lithium-ion secondary battery, the difference between this embodiment and embodiment 1 is that the polyvinylidene fluoride physical gel used in the center pin 30 is a mixture of PVDF-HFP and homopolymerized PVDF gel. The polyvinylidene fluoride physical gel uses polyvinylidene fluoride copolymers with a melting point of 130-145° C. as raw materials, and the comonomers are copolymerized with hexafluoropropylene. The upper and lower ends of the cylindrical center pin 30 have a disc-shaped structure, wherein the upper disc-shaped structure 31 is provided with a groove 32 to facilitate the extraction of the tab (according to requirements, if the tab is drawn from the lower disc-shaped structure 31, it can also be Offer the groove 32 that draws tab on the disc structure 31 of lower end. So that it is easier to absorb electrolyte, battery liquid retention is better, and battery is not easy to leak. Other structures and...

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Abstract

The invention discloses a lithium iron secondary battery comprising a shell and an electrode polar group contained in the shell. A center pin is arranged in the electrode polar group. The center pin is gel with a miniature multi-hole structure, which causes the electrolyte to enter the gel with a miniature multi-hole structure, and when the gel absorbs the electrolyte, a horizontal force is generated to press the electrode polar group due to the expanding of the solution. The invention also discloses a method for manufacturing the lithium iron secondary battery. The invention is in favor of solving the problems of the existed non-uniformity of the electrolyte and solution-leakage in the process of charge and discharge of the cylinder lithium iron battery.

Description

technical field [0001] The invention relates to the field of lithium-ion secondary batteries, in particular to lithium-ion secondary batteries and a manufacturing method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, high energy density, and environmental protection, and are widely used in notebook computers, video cameras, digital cameras, PDAs (Personal Digital Assistants) and other mobile communication terminal products. , Large demand and broad market prospects. [0003] At present, the electrode groups of lithium-ion secondary batteries commonly used are all wound by winding machines. There is a certain cylindrical space in the core of the electrode group. During the charging and discharging process of the battery, the electrode group will occur. Space deformation, and then will be pushed into the cylindrical space, resulting in deformation of the electrode group, and may even lead to electronic short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/38H01M10/02H01M2/00H01M10/0525H01M10/058H01M50/233
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 李鑫刘先龙
Owner SHENZHEN BAK POWER BATTERY CO LTD
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